Scarifying attachment for road-machines.



" D. G. BOYD.

SGARIFYING ATTACHMENT FOR ROAD MAGHINES.

APPLICATION FILED JUNE 4, 1912.

Patented Apr. 15, 1913.

' ghwewtoz J. C

i constructed that it may I to the mold-board brackets by whlch a navrn c. corn, or oemononxo.

SGARIIEYING ATTACHMENT FOR ROAD-MCHINES. p

Specification of Letters Patent.

Patented Apr. 15, 1913.

Application filed ans 4. 1912. Serial No. 701,671.

I? '0 all whom it may concern Be it known that L DAVID 0. Born, citi-j zen of the United States, residing at Galion, in the county of Crawford and 'State of Ohio, have invented certain new and useful Improvements in Scarifying Attachments for Road-Machines, of which the following is a specification.

My invention relates to road making chines and particularly to a' scarify-ing attachment therefor.

The primary object of my invention is the provision of a scarifying attachment so be readily applied scraper or mold-board of a road making machme or grader 1s supported. A further ob ect is to provide an attachment of this character with removahle and reversible teeth.

A. still further object is to provide scarifying teethdisposed at an angle of aboutforty-five degrees to the line of draft and so twisted that the cutting or scarifying oints face the line of draft. that is, are disposed transversely to the length of the machine, the teeth being so formed as to provide shoulders assisting in holding the teeth from any vertical movement and centering the teeth with relation to the tooth carrying bar upon which they are mounted.

Further objects will appear in the course of the following description.

An embodiment of my invention is illustrated in the accompanying drawings, wherein:

Figure l is a side elevation of a road machineequipped with my scarifying attachment; Fig. 2 is a perspective view of the waarifying attachment; Fig. 3 is an elevalion of one of the scarifying teeth; Fig. 4 isntransverse sectionalview on the line of Fig. 3: Fig. 5 is a vertical section through the tooth supporting bar the tooth attached therctoebeing shown in side elevation.

Corresponding and like parts are referred to in the following description and indicated in all the views of the accompanying drawings by the same reference characters.

My invention isadapted to be applied to any ordinary road, grader or s-craperaiid such a road grader or scraper is illustrated in Fig. 1. The scrap r supporting frame may be of any suitable or usual construction but is shown composed of side bars 2 which diverge toward the rear of the machine and which are supported at their front end by front Wheels 3 by the rear wheels 4.

Pivotally mounted upon the front end of the machine and extending rearwardlv between and below the bars 2 of the frame, are the vertically movable The free ends of these bars being supported for The particular dctails'of this vertical ladjustment however, need not be described as they form-no part of my invention and as means for securing this vertical adjustment are old and well known.

are shown. as vertical adjustment.

Mountedupon. the bars 5, is an annulus 6 which may be rotatably adjusted relative to the axis of the scraper. Projecting downward and outward from the annulus 6, are the brackets 7. These brackets 'maybe attached to the annulus in any suitable man nor and each bracket is formed with a concave scraper supporting face 8. Where the machine 18 used as a road grader or scraper, a vertically concave scraping blade is mounted upon these brackets, the convex face'of the blade contactingwith and engaging the concave faces of the brackets 7. My invention consists in the revision of a scarifier ada ted to be dispose upon these brackets in p ace of the scraper blade so that the scraper blade and the scarifying attachment may be interchanged whenever necessary and the machine thus adapted for scarifying or cutting 11 a hard road bed or for scraping or .gra' ing said road bed.

This scarifying attachment consists of a bar 9 angular in cross section. To the rear side of this bar are attached su porting members 10 which, when the scari er is in place, form continuations of the brackets 7. Each of these supporting brackets is approximately T-shaped and formed with a convexly curved head 11 adapted to fit snugly against the concave face 8 of the brackets 7 and to be bolted to the brackets 7 so that the members 10 form practically continuations of the brackets 7. The outer end (if ach supporting bracket is angular in form so that one face of the end will fit against the upwardly'extending flange, of the angle iron 9, while the lower face of the end will fit against the horizontally and rearwardly extending flange of the angle iron. This provides a very firm resistance to the strain exerted upon the angle bar 9 frame bars 5.

and at its rear end "-{Qi It is peculiarly ..,:ing teeth be held fr ment with relation to, the bar 9, and that the I nated 14, has a length approximately when the scarifier is in action. The pressure against the lower ends of the scarifier teeth would tend to twist the bar 9 but the rearwardly projecting flange of the bar, 5 bearingas it. does against the lower facesof the forwardly projecting ends of 'the' bracket 10, resists this rotation of the bar and holds these. scarifier teeth in a vertical aositionso that the pressure against the 16"" eth is transmitted to the brackets 8, Passing through the face of the bar 9,-- are a plurality of pairs of U-shaped bolts v12, the

its of each pair being arranged in vertical 're1ati'on andso disposed as 'to clamp a scari- 18 ing tooth 13 firmly into engagement with t e bar.

essential that the'scarify om any vertical movev 80 above and below the middle portion 14 are twisted in opposite directions so that each end of the tooth is at an angle of fortyfive degrees with the face of the middle portion. t will be seen that this'twisting'of the material of each tooth brin s the edge of the material at an angle of a out fortyfive degrees with the face of the middle ortion 14, and that the'."-"eiids of the bar a ve and below the middle ortion thus form the 40 points or cutting en s of the scarifyin tooth. The edges of the bar above the mi dle portion are beveled as at15 and the points are bent outward sothat the front of the cutting extremity of the tooth is somewhat concavely curved, while the back, of

each cutting extremity is convexly curved, thus each cutting extremity has approximately the shape of a plow peculiarly adapted to dig in and cut throu the ground.

It is to be particulary noted, that the twist given to the extremities-5f the teeth, which twist begins at the point provides opposed shoulders 17 which engage,the .u

per and lower edges-of the -bal: -9- w1hen t e teeth are in place, and theselshoulders so engaging the bar 9, prevent an" vertical shifting of the tooth when the b0 ts 12 are clamped tightly upon the tooth. Furthermore, these shoulders act to center 'the 'tooth properly with relationto the bar so that in adjusting the tooth no particular care need be taken so long as the tooth lies fiat against the face of the bar 9, the tooth must be properly centered because of these shoulders, thus al of the teeth will cut to the same I convenient.

depth. Furthermorait lwill be Sara as the teeth are double pointed and, the pointed parts. are twistedga guarter turn the teeth arereversibleg {The proper maniiitf usin the scarifier istoidmpose theba'r 9 one s I forty-five'rljegrees'to the, line of draft "The ant of about one quarter turn or twist given to" the extremities of the scarifierteeth will cause the teeth toi squarely/{enter the surface of, the ground or the macadam and follow straight and true to theline of draft, It will be seen that the teeth maybeeasily removed or re placed, and that if; one of the cutting ends of a tooth isbroken it may be readlly reversed. It will be seenfurther that the opposite ends of the tooth are curved in such a manner that when the position of the. tooth on the bar is reversed the lower end of the tooth will always be turned forward.

I have found in practice that the scarifying attachment above described is extremely road machirie-to be used either as a scarifier or as a scraper, and while the teeth are held rigidly against vertical movement relative to the bar 9, they may be readily removed, replaced or reversed when Worn.

Having thus described the invention, what is claimed as new is:

1. The combination with the frame of a road making machine, on the frame, oppositely disposed brackets supported on the annulus projecting downward therefrom and .havin concavely curved outer faces, of ascari ing attachment comprising a supporting bar extending trapsversely to the line of draft, said supporting bar bein angular in section and having a vertical ange and a horizontal forward en s formed to fit against both the horizontal and the vertical flange of said bar and having their rear ends formed with a vertically extended head having a convex inner face adapted to fit against the concave faces of the brackets, said su porting members being removably attache to the brackets, and detachable vertically arranged scari ing teeth mounted upon said bar,

2. scarifying attachment for road making machines com rising an angular bar having a vertical ange and a rearwardly projecting horizontal flange, supportin members projecting from the rear face o the bar the end of each sup orting member having a horizontal face an a vertical face to fit against the vertical and horizontal flanges of said bar, the rear ends of said supportin menibers bein vertically en larged' and the rear face 0 each sup orting member being convexly curved, a p urality of pairs of ,U-shaped clamping oltsarranged in vertical relation along the bar,

an annulus supported,

As before stated, it permits a flange, sup ortlng members havlng their and a plurality of scarifying teeth each supa flat middle portion fitting flat against the face of the bar and having a length equal to the vertical Width oi the bar, the upper and "lower ends of each tooth above and below the bar eing tapered and twisted in opposite directions to provide scarifyin'g points facing in angular relation to the middle portion of the tooth, each of these terminal ends being curved laterally, the bases of the twisted portions forming shoulders engaging the upper and'lower edges of the bar to assist in preventing any vertical movement of the tooth and to center the tooth with relation to the bar.

In testimony whereof I afiix my signature in presence of twowitnesses.

DAVID C. BOYD. as Witnesses:

-Gr. S. STIEPL,

DEAN C. TALBOTT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents,

Washington, D. C. 

